I have noticed a difference in spacing for the scope rings on some of my contender weaver mounts. I assumed they would all be the the same allowing me to change a scope from one barrel to another without moving the position of the ring on the scope. Has anyone else run into this problem? If so anyone here interested in trading bases so they all match?
Just a thought- Tad 
Are those Weaver bases or Weaver style bases. I noticed the same thing on some of other manufacturers. I am just using the Weaver bases on my carbine and rifle barrels and they all interchange perfectly. Some of the other brands like Millet space a little bit different.
On the pistol barrels I am using the Luepold/Redfield single dovetail bases.
Which bases do you have on your barrels?